WRTSL54GS from thibor17 rc3 to DDWRT...

I have a WRTSL54GS running v2.07.0, HyperWRT + thibor17 rc3 and wish to change over to DDWRT v24 for some experimentation. Having never changed from one firmware to another, (aside from upgrading from Linksys to thibor) what is the best way to accomplish this?